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| author | Christoph Lameter <clameter@sgi.com> | 2007-07-15 23:38:14 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-07-16 09:05:36 -0700 |
| commit | f0630fff54a239efbbd89faf6a62da071ef1ff78 (patch) | |
| tree | 4004adc3adf4dbe1a6188ca0bbd56f7606d4d05f /mm | |
| parent | fc9a07e7bf1a76e710f5df017abb07628db1781d (diff) | |
| download | linux-f0630fff54a239efbbd89faf6a62da071ef1ff78.tar.gz linux-f0630fff54a239efbbd89faf6a62da071ef1ff78.tar.bz2 linux-f0630fff54a239efbbd89faf6a62da071ef1ff78.zip | |
SLUB: support slub_debug on by default
Add a new configuration variable
CONFIG_SLUB_DEBUG_ON
If set then the kernel will be booted by default with slab debugging
switched on. Similar to CONFIG_SLAB_DEBUG. By default slab debugging
is available but must be enabled by specifying "slub_debug" as a
kernel parameter.
Also add support to switch off slab debugging for a kernel that was
built with CONFIG_SLUB_DEBUG_ON. This works by specifying
slub_debug=-
as a kernel parameter.
Dave Jones wanted this feature.
http://marc.info/?l=linux-kernel&m=118072189913045&w=2
[akpm@linux-foundation.org: clean up switch statement]
Signed-off-by: Christoph Lameter <clameter@sgi.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm')
| -rw-r--r-- | mm/slub.c | 79 |
1 files changed, 51 insertions, 28 deletions
diff --git a/mm/slub.c b/mm/slub.c index e0cf6213abc0..6aea48942c29 100644 --- a/mm/slub.c +++ b/mm/slub.c @@ -323,7 +323,11 @@ static inline int slab_index(void *p, struct kmem_cache *s, void *addr) /* * Debug settings: */ +#ifdef CONFIG_SLUB_DEBUG_ON +static int slub_debug = DEBUG_DEFAULT_FLAGS; +#else static int slub_debug; +#endif static char *slub_debug_slabs; @@ -888,38 +892,57 @@ fail: static int __init setup_slub_debug(char *str) { - if (!str || *str != '=') - slub_debug = DEBUG_DEFAULT_FLAGS; - else { - str++; - if (*str == 0 || *str == ',') - slub_debug = DEBUG_DEFAULT_FLAGS; - else - for( ;*str && *str != ','; str++) - switch (*str) { - case 'f' : case 'F' : - slub_debug |= SLAB_DEBUG_FREE; - break; - case 'z' : case 'Z' : - slub_debug |= SLAB_RED_ZONE; - break; - case 'p' : case 'P' : - slub_debug |= SLAB_POISON; - break; - case 'u' : case 'U' : - slub_debug |= SLAB_STORE_USER; - break; - case 't' : case 'T' : - slub_debug |= SLAB_TRACE; - break; - default: - printk(KERN_ERR "slub_debug option '%c' " - "unknown. skipped\n",*str); - } + slub_debug = DEBUG_DEFAULT_FLAGS; + if (*str++ != '=' || !*str) + /* + * No options specified. Switch on full debugging. + */ + goto out; + + if (*str == ',') + /* + * No options but restriction on slabs. This means full + * debugging for slabs matching a pattern. + */ + goto check_slabs; + + slub_debug = 0; + if (*str == '-') + /* + * Switch off all debugging measures. + */ + goto out; + + /* + * Determine which debug features should be switched on + */ + for ( ;*str && *str != ','; str++) { + switch (tolower(*str)) { + case 'f': + slub_debug |= SLAB_DEBUG_FREE; + break; + case 'z': + slub_debug |= SLAB_RED_ZONE; + break; + case 'p': + slub_debug |= SLAB_POISON; + break; + case 'u': + slub_debug |= SLAB_STORE_USER; + break; + case 't': + slub_debug |= SLAB_TRACE; + break; + default: + printk(KERN_ERR "slub_debug option '%c' " + "unknown. skipped\n",*str); + } } +check_slabs: if (*str == ',') slub_debug_slabs = str + 1; +out: return 1; } |